LOS ANGELES—A former auto manufacturing company manager from Irvine was arrested on March 24 on a federal charge alleging he solicited a $5 million bribe from a South Korean firm with promises of delivering a large contract for various car parts. Hyoung Nam So, 46, also known as Brian So, surrendered to federal authorities after a grand jury on March 23 charged him with bribery conspiracy. So is expected to be arraigned on the one-count indictment on March 24 afternoon in Los Angeles federal court. The indictment alleges that the foreign parts supplier paid So a total of $3.45 million in cash. Homeland Security Investigations seized $3.19 million believed to be proceeds from the bribery scheme from a private vault in Los Altos in 2017, and federal authorities subsequently returned the money to South Korean authorities, according to the U.S. Attorney’s Office. As a manager and team leader at the …